Defendants appeal from an order granting a new trial after a jury had rendered a verdict in their favor in two actions, consolidated for trial and appeal, involving personal injuries to plaintiffs, a mother and daughter, who were injured while they were passengers for hire on defendant California Street Cable Railway Company’s system. The *643 other defendants, Hall and Hill, are respectively the grip-man or operator of the cable car and the conductor.
The plaintiffs were mother and an adult daughter, who were riding home from church about noon one Sunday. The plaintiffs produced evidence to show that they were standing in the space behind the gripman, the mother on the inside and the daughter on the outside, to the gripman’s left; that the speed of the cable car increased as it progressed on Pine Street toward the curve at Hyde Street; that as the car went around the curve the car seemed to jerk their feet from under them and they were thrown off the platform, thereby sustaining severe injuries. The defendants produced evidence to show that there were seats available; that the car proceeded at its usual speed around the curve, 2 to 5 m.p.h., after having come to a full stop when letting go of the cable in order to make the curve; that the gripman shouted his usual warning as he approached the curve; and that the mother was on the outside and the daughter on the inside of the platform; and that there was no unusual movement of the ear immediately preceding the accident. The gripman further testified that he saw the two plaintiffs tighten their grips on the hand bar as he shouted the usual warning.
The motion of plaintiffs for a new trial specified all the statutory grounds except misconduct and excessive damages. The order granting the motion for a new trial did not specify insufficiency of the evidence as a ground upon which the order was based; therefore on appeal it must be conclusively presumed that the order was not' based upon that ground. (Code Civ. Proc., § 657.) The failure of the trial court to specify the particular ground or grounds upon which the order was made forces the appellate court by a process of elimination to attempt to determine the error or errors which prompted the trial judge to grant the new trial. Appellants in the opening brief state “The Court ruled that error was committed in the instance of one instruction and granted a new trial on that ground.” They thereupon confined their opening argument to the one instruction. Respondents claim that the above statement is untrue and refer to additional instructions as erroneous. No irregularity in the proceedings, such as the improper admission of evidence, the inadequacy of the pleadings, the omission to serve respective parties, abuse of discretion by the trial judge, etc., has been called to the court’s attention, and an examination of the record does not *644 reveal any such error which would have justified the granting of the new trial. Consequently the discussion herein will be limited to the points raised by appellants and respondents. Bach allegedly erroneous instruction will be considered in order to guide the trial court in the new trial necessitated by the conclusion reached herein.
The first disputed instruction given at the request of defendants reads: “A passenger on a street car is not entitled to recover damages, if any, sustained by a fall from or upon a street car caused by movement of said street car, unless you find that such movement, if any, was unusual, unnecessary, and violent.” Throughout the arguments defendants are pleased to refer to the “fall from the street car,” whereas plaintiffs seem delighted to use the expression “thrown from the car.” The word “thrown” is used in the complaint. One of the plaintiffs testified that the car was traveling at an excessive speed and her feet seemed to jerk from under her. The second plaintiff, on account of a nervous affliction from which she was suffering prior to the accident, did not testify. All other witnesses either refrained from corroborating the plaintiff or in substance testified that there was no unusual movement or speed of the car, or any violence in its operation.
Where personal injury is caused to a passenger for hire of a common carrier by some movement of the carrier, an inference of negligence on the part of the carrier may be drawn by the jury in the absence of a showing that the movement occurred through no negligence of the carrier. On the basis of plaintiff’s testimony as to causation, the jury was properly instructed on this res ipsa loquitur situation.
(Waite
v.
Pacific Gas & Elec. Co.,
For the foregoing reasons the instruction is erroneous. Consequently, on motion for new trial it was the duty of the trial court to determine whether it was prejudicially erroneous. In
Nance
v.
Fresno City Lines, Inc.,
There is no merit in the plaintiffs’ contention that the court should not have instructed on the theory of unavoidable accident. Cable cars running west to operate on tracks running north, must turn corners or curves; a certain amount of centrifugal force is bound to be generated; the jury could have believed that even though both parties exercised their respective duties of care, the accident happened as a result of the ordinary and necessary incidents of cable car operation. Neither is there merit in plaintiffs’ claim that the court erred in instructing on contributory negligence in view of all the circumstances of the ease. The propriety of an instruction relative to the defendant’s not being an insurer is questionable. The use of the word “insurer” is generally inadvisable as it may be misunderstood by the jury. The word “guarantor” seems preferable. If litigants persist in the use of the word “insurer,” then the instruction designated 204-D, Palmer’s California Jury Instructions, Civil, page 298, seems to be a safer form to use. No doubt on a retrial, this instruction will be reframed to indicate to the jury that it was not intended that “insurer” meant anything except to make it clear to layman jurors that the high duty of care imposed on common carriers does not rise to the degree of a guarantee.
The order appealed from is affirmed.
Peters, P. J., and Knight, J., concurred.
